#include<stdio.h>
int main()
{
    char s[] = "012xy";
    int i = 0;
    int n = 0;
    for (i = 0; s[i] != 0; i++)
        if (s[i] >= 'a' && s[i] <= 'z')
            n++;
    printf("%d\n", n);
    return 0;
}